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C++ Client Libraries | Google Cloud

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An idiomatic C++ client library for the Discovery Engine API, a service that powers high-quality content recommendations on your digital properties.

While this library is GA, please note that the Google Cloud C++ client libraries do not follow Semantic Versioning.

The following shows the code that you'll run in the google/cloud/discoveryengine/quickstart/ directory, which should give you a taste of the Discovery Engine API C++ client library API.

#include "google/cloud/discoveryengine/v1/document_client.h"
#include "google/cloud/location.h"
#include <iostream>

int main(int argc, char* argv[]) try {
  if (argc != 2) {
    std::cerr << "Usage: " << argv[0] << " project-id\n";
    return 1;
  }

  auto const location = google::cloud::Location(argv[1], "global");

  namespace discoveryengine = ::google::cloud::discoveryengine_v1;
  auto client = discoveryengine::DocumentServiceClient(
      discoveryengine::MakeDocumentServiceConnection());

  auto const parent = location.FullName() +
                      "/dataStores/default_data_store/branches/default_branch";
  for (auto d : client.ListDocuments(parent)) {
    if (!d) throw std::move(d).status();
    std::cout << d->DebugString() << "\n";
  }

  return 0;
} catch (google::cloud::Status const& status) {
  std::cerr << "google::cloud::Status thrown: " << status << "\n";
  return 1;
}

This library offers multiple *Client classes, which are listed below. Each one of these classes exposes all the RPCs for a service as member functions of the class. This library groups multiple services because they are part of the same product or are often used together. A typical example may be the administrative and data plane operations for a single product.

The library also has other classes that provide helpers, configuration parameters, and infrastructure to mock the *Client classes when testing your application.

• discoveryengine_v1::CompletionServiceClient
• discoveryengine_v1::ConversationalSearchServiceClient
• discoveryengine_v1::DocumentServiceClient
• discoveryengine_v1::SchemaServiceClient
• discoveryengine_v1::SearchServiceClient
• discoveryengine_v1::UserEventServiceClient

• Error Handling - describes how the library reports errors.
• How to Override the Default Endpoint - describes how to override the default endpoint.
• How to Override the Authentication Credentials - describes how to change the authentication credentials used by the library.
• Override Retry, Backoff, and Idempotency Policies - describes how to change the default retry policies.
• Environment Variables - describes environment variables that can configure the behavior of the library.

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-08-14 UTC.

[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["The Discovery Engine API C++ Client Library is a GA idiomatic library for powering high-quality content recommendations on digital properties."],["The latest release candidate version is 2.37.0-rc, while 2.23.0 is the displayed version, with various older versions available for reference."],["This C++ client library does not follow Semantic Versioning guidelines, so keep that in mind when integrating."],["The library features several client classes, including CompletionServiceClient, ConversationalSearchServiceClient, DocumentServiceClient, SchemaServiceClient, SearchServiceClient, and UserEventServiceClient, each for related sets of service RPCs."],["The library provides options for error handling, endpoint overrides, authentication changes, and modifying retry policies, all of which can be further configured through specific environment variables."]]],[]]

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